Longman Dictionary of Contemporary English homepage

anaphylactic shock

 noun
     
an‧a‧phy‧lac‧tic shock [uncountable] medical
a very sudden serious physical reaction that is caused by an allergy to something such as nuts, eggs, or the sting of some insects. The reaction causes shock, breathing difficulties, and sometimes death.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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